refactor: restructure repo into src/ site/ dist/ vendor/ packs/

Separate framework source from website:
- src/layers/ + src/main.css: CSS framework source (was assets/css/)
- site/: Hugo website (content/, layouts/, hugo.toml)
- dist/: built output (asw.css, asw.min.css)
- vendor/open-props/: vendored dependency with version tracking
- Hugo module mounts: dist/ → static, site runs from site/

Build: hugo --source site/ passes (105 pages).
npm run build produces dist/asw.css.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hugo.toml

@@ -1,147 +0,0 @@
-baseURL = 'https://asw.trentuna.com/'
-languageCode = 'en'
-title = 'ASW — Agentic Semantic Web'
-
-[params]
-  description = "Agentic Semantic Web — semantic HTML, data-* attributes, and CSS-only styling for the agentic era."
-
-[taxonomies]
-  tag = "tags"
-
-# ── Navigation menus ──────────────────────────────────────────────────
-[[menus.main]]
-  name = "Home"
-  url  = "/"
-  weight = 1
-
-[[menus.main]]
-  name = "Docs"
-  url  = "/docs/"
-  weight = 2
-
-[[menus.main]]
-  name = "Notes"
-  url  = "/notes/"
-  weight = 3
-
-[[menus.main]]
-  name = "Essays"
-  url  = "/essays/"
-  weight = 4
-
-[[menus.main]]
-  name = "Articles"
-  url  = "/articles/"
-  weight = 5
-
-[[menus.main]]
-  name = "Tags"
-  url  = "/tags/"
-  weight = 6
-
-# ── Docs sidebar menu ─────────────────────────────────────────────────
-# Parent entries (identifier set, no url) render as <small> section labels.
-# Child entries (parent set) render as sidebar nav links.
-
-[[menus.docs]]
-  name       = "Getting Started"
-  identifier = "docs-getting-started"
-  weight     = 10
-
-[[menus.docs]]
-  name   = "Introduction"
-  url    = "/docs/introduction/"
-  parent = "docs-getting-started"
-  weight = 11
-
-[[menus.docs]]
-  name       = "Core"
-  identifier = "docs-core"
-  weight     = 20
-
-[[menus.docs]]
-  name   = "Reset"
-  url    = "/docs/reset/"
-  parent = "docs-core"
-  weight = 21
-
-[[menus.docs]]
-  name   = "Semantic HTML"
-  url    = "/docs/on-semantic-html/"
-  parent = "docs-core"
-  weight = 22
-
-[[menus.docs]]
-  name   = "Data Attributes"
-  url    = "/docs/data-attributes/"
-  parent = "docs-core"
-  weight = 23
-
-[[menus.docs]]
-  name       = "Components"
-  identifier = "docs-components"
-  weight     = 30
-
-[[menus.docs]]
-  name   = "Layouts"
-  url    = "/docs/layouts/"
-  parent = "docs-components"
-  weight = 31
-
-[[menus.docs]]
-  name   = "Components"
-  url    = "/docs/components/"
-  parent = "docs-components"
-  weight = 32
-
-[[menus.docs]]
-  name   = "Accordion & Dialog"
-  url    = "/docs/accordion-dialog/"
-  parent = "docs-components"
-  weight = 33
-
-[[menus.docs]]
-  name   = "Navigation"
-  url    = "/docs/navigation/"
-  parent = "docs-components"
-  weight = 34
-
-[[menus.docs]]
-  name       = "Reference"
-  identifier = "docs-reference"
-  weight     = 40
-
-[[menus.docs]]
-  name   = "Charts"
-  url    = "/docs/charts/"
-  parent = "docs-reference"
-  weight = 41
-
-[[menus.docs]]
-  name   = "Syntax Highlighting"
-  url    = "/docs/chroma/"
-  parent = "docs-reference"
-  weight = 42
-
-[[menus.docs]]
-  name   = "ASW Vocabulary"
-  url    = "/articles/asw-vocabulary/"
-  parent = "docs-reference"
-  weight = 43
-
-# ── Markup settings ───────────────────────────────────────────────────
-[markup.goldmark.renderer]
-  unsafe = true  # allow inline HTML in markdown (<mark>, <time>, etc.)
-
-[markup.tableOfContents]
-  startLevel = 2
-  endLevel   = 3
-  ordered    = false
-
-[markup.highlight]
-  noClasses   = true
-  codeFences  = true
-  guessSyntax = true
-
-[build.buildStats]
-  enable = true